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Normal values range from less than 75 - 190 pg/mL (picograms per milliliter).
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
A higher-than-normal level along with symptoms of watery diarrhea and flushing may be a sign of a VIPoma.
Jensen RT. Pancreatic endocrine tumors. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 205.